#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
void swap(int* x, int* y)
{
	*x ^= *y;
	*y ^= *x;
	*x ^= *y;
}
int main()
{
	int a = 10, b = 20;
	swap(&a, &b);
	printf("a=%d,b=%d", a, b);
	return 0;
}